Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies
We examine the relationship between source radio luminosity and kinetic power in active galactic nucleus jets. We show that neglecting various loss processes can introduce a systematic bias in the jet powers inferred from radio luminosities for a sample of radio galaxies. This bias can be corrected...
| Main Authors: | , |
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| Format: | Journal Article |
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Institute of Physics Publishing, Inc.
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/8049 |
| _version_ | 1848745544417017856 |
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| author | Shabala, S. Godfrey, L. |
| author_facet | Shabala, S. Godfrey, L. |
| author_sort | Shabala, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We examine the relationship between source radio luminosity and kinetic power in active galactic nucleus jets. We show that neglecting various loss processes can introduce a systematic bias in the jet powers inferred from radio luminosities for a sample of radio galaxies. This bias can be corrected for by considering source size as well as radio luminosity; effectively the source size acts as a proxy for source age. Based on a sample of Fanaroff-Riley Type II radio sources with jet powers derived from the measured hotspot parameters, we empirically determine a new expression for jet power that accounts for the source size, (Qjet/1036 W) = 1.5+1.8 −0.8(L151/1027WHz−1)0.8(1 + z)1.0(D/kpc)0.58±0.17, where D is source size and L 151 the 151 MHz radio luminosity. By comparing a flux-limited and volume-limited sample, we show that any derived radio-luminosity-jet-power relation depends sensitively on sample properties, in particular the source size distribution and the size-luminosity correlation inherent in the sample. Such bias will affect the accuracy of the kinetic luminosity function derived from lobe radio luminosities and should be treated with caution. |
| first_indexed | 2025-11-14T06:19:03Z |
| format | Journal Article |
| id | curtin-20.500.11937-8049 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:19:03Z |
| publishDate | 2013 |
| publisher | Institute of Physics Publishing, Inc. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-80492023-02-22T06:24:16Z Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies Shabala, S. Godfrey, L. quasars: general galaxies: jets galaxies: active We examine the relationship between source radio luminosity and kinetic power in active galactic nucleus jets. We show that neglecting various loss processes can introduce a systematic bias in the jet powers inferred from radio luminosities for a sample of radio galaxies. This bias can be corrected for by considering source size as well as radio luminosity; effectively the source size acts as a proxy for source age. Based on a sample of Fanaroff-Riley Type II radio sources with jet powers derived from the measured hotspot parameters, we empirically determine a new expression for jet power that accounts for the source size, (Qjet/1036 W) = 1.5+1.8 −0.8(L151/1027WHz−1)0.8(1 + z)1.0(D/kpc)0.58±0.17, where D is source size and L 151 the 151 MHz radio luminosity. By comparing a flux-limited and volume-limited sample, we show that any derived radio-luminosity-jet-power relation depends sensitively on sample properties, in particular the source size distribution and the size-luminosity correlation inherent in the sample. Such bias will affect the accuracy of the kinetic luminosity function derived from lobe radio luminosities and should be treated with caution. 2013 Journal Article http://hdl.handle.net/20.500.11937/8049 10.1088/0004-637X/769/2/129 Institute of Physics Publishing, Inc. unknown |
| spellingShingle | quasars: general galaxies: jets galaxies: active Shabala, S. Godfrey, L. Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies |
| title | Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies |
| title_full | Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies |
| title_fullStr | Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies |
| title_full_unstemmed | Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies |
| title_short | Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies |
| title_sort | size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies |
| topic | quasars: general galaxies: jets galaxies: active |
| url | http://hdl.handle.net/20.500.11937/8049 |